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Kubernetes轻量级日志工具Loki安装及踩坑记录

时间：2023-07-13 15:23:50浏览次数：51  
标签：__ name Kubernetes labels Loki kubernetes pod loki 轻量级

Loki简介

Loki是Grafana出品的一个轻量级日志系统，熟悉ELK的都知道ELK使用起来的成本，而且仅仅是日志检索使用ELK的话有点大材小用了。Loki8技术栈中使用了以下组件。

  • Promtail
    用来将容器日志发送到 Loki 或者 Grafana 服务上的日志收集工具，该工具主要包括发现采集目标以及给日志流添加上 Label 标签 然后发送给 Loki，Promtail 的服务发现是基于 Prometheus 的服务发现机制实现的。
  • Loki
    受 Prometheus 启发的可以水平扩展、高可用以及支持多租户的日志聚合系统，使用了和 Prometheus 相同的服务发现机制，将标签添加到日志流中而不是构建全文索引，从 Promtail 接收到的日志和应用的 metrics 指标就具有相同的标签集，不仅提供了更好的日志和指标之间的上下文切换，还避免了对日志进行全文索引。
  • Grafana
    一个用于监控和可视化观测的开源平台，支持非常丰富的数据源，在 Loki 技术栈中它专门用来展示来自 Prometheus 和 Loki 等数据源的时间序列数据，可进行查询、可视化、报警等操作，可以用于创建、探索和共享数据 Dashboard，鼓励数据驱动。

Loki的工作原理如下图所示：
image

安装

Loki

关于k8s如何创建应用就不再赘述，Loki在接收日志后会对日志数据进行一定的加工整理，因为存储的数据为有状态的，安装时候推荐使用StatefulSet。创建文件loki.yaml，文件内容如下：

apiVersion: v1
kind: ServiceAccount
metadata:
  name: loki
  namespace: logging
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: loki
  namespace: logging
rules:
- apiGroups:
  - extensions
  resourceNames:
  - loki
  resources:
  - podsecuritypolicies
  verbs:
  - use
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: loki
  namespace: logging
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: loki
subjects:
- kind: ServiceAccount
  name: loki
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: loki
  namespace: logging
  labels:
    app: loki
data:
  loki.yaml: |
    auth_enabled: false
    ingester:
      chunk_idle_period: 3m
      chunk_block_size: 262144
      chunk_retain_period: 1m
      max_transfer_retries: 0
      lifecycler:
        ring:
          kvstore:
            store: inmemory
          replication_factor: 1
    limits_config:
      enforce_metric_name: false
      reject_old_samples: true
      reject_old_samples_max_age: 168h
    schema_config:
      configs:
      - from: "2022-05-15"
        store: boltdb-shipper
        object_store: filesystem
        schema: v11
        index:
          prefix: index_
          period: 24h
    server:
      http_listen_port: 3100
    storage_config:
      boltdb_shipper:
        active_index_directory: /data/loki/boltdb-shipper-active
        cache_location: /data/loki/boltdb-shipper-cache
        cache_ttl: 24h
        shared_store: filesystem
      filesystem:
        directory: /data/loki/chunks
    chunk_store_config:
      max_look_back_period: 0s
    table_manager:
      retention_deletes_enabled: true
      retention_period: 48h
    compactor:
      working_directory: /data/loki/boltdb-shipper-compactor
      shared_store: filesystem
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: loki
  namespace: logging
  labels:
    app: loki
spec:
  podManagementPolicy: OrderedReady
  replicas: 1
  selector:
    matchLabels:
      app: loki
  serviceName: loki
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: loki
    spec:
      serviceAccountName: loki
      securityContext:
          fsGroup: 10001
          runAsGroup: 10001
          runAsNonRoot: true
          runAsUser: 10001
      initContainers: []
      containers:
        - name: loki
          image: grafana/loki:2.3.0
          imagePullPolicy: IfNotPresent
          args:
            - -config.file=/etc/loki/loki.yaml
          volumeMounts:
            - name: config
              mountPath: /etc/loki
            - name: loki-storage
              mountPath: /data
          ports:
            - name: http-metrics
              containerPort: 3100
              protocol: TCP
          livenessProbe:
            httpGet: 
              path: /ready
              port: http-metrics
              scheme: HTTP
            initialDelaySeconds: 45
            timeoutSeconds: 1
            periodSeconds: 10
            successThreshold: 1
            failureThreshold: 3
          readinessProbe:
            httpGet: 
              path: /ready
              port: http-metrics
              scheme: HTTP
            initialDelaySeconds: 45
            timeoutSeconds: 1
            periodSeconds: 10
            successThreshold: 1
            failureThreshold: 3
          securityContext:
            readOnlyRootFilesystem: true
      terminationGracePeriodSeconds: 4800
      imagePullSecrets:
        - name: your-secret
      volumes:
        - name: config
          configMap:
            defaultMode: 420
            name: loki
  volumeClaimTemplates:
    - metadata:
        name: loki-storage
        labels:
          app: loki
      spec:
        accessModes:
          - ReadWriteOnce
        resources:
          requests:
            storage: 3Gi
        volumeMode: Filesystem
---
apiVersion: v1
kind: Service
metadata:
  name: loki
  namespace: logging
  labels:
    app: loki
spec:
  type: ClusterIP
  ports:
    - port: 3100
      protocol: TCP
      name: http-metrics
      targetPort: http-metrics
  selector:
    app: loki
---
apiVersion: v1
kind: Service
metadata:
  name: loki-outer
  namespace: logging
  labels:
    app: loki
spec:
  type: NodePort
  ports:
    - port: 3100
      protocol: TCP
      name: http-metrics
      targetPort: http-metrics
      nodePort: 32537
  selector:
    app: loki
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: loki-storage
spec:
  capacity:
    storage: 5Gi
  nfs:
    server: yourIP
    path: /data/loki
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  volumeMode: Filesystem

Grafana

Grafana的功能就不再多说了，YYDS，用来做可视化界面，创建loki-grafana.yml，文件内容如下：

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: grafana-pvc
  namespace: logging
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  volumeName: grafana-storage
  volumeMode: Filesystem
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: grafana-storage
spec:
  capacity:
    storage: 10Gi
  nfs:
    server: yourIp
    path: /data/loki/grafana
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  volumeMode: Filesystem
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: grafana
  name: grafana
  namespace: logging
spec:
  selector:
    matchLabels:
      app: grafana
  template:
    metadata:
      labels:
        app: grafana
    spec:
      securityContext:
        fsGroup: 472
        supplementalGroups:
          - 0
      containers:
        - name: grafana
          image: grafana/grafana
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 3000
              name: http-grafana
              protocol: TCP
          resources:
            requests:
              cpu: 500m
              memory: 1024Mi
            limits:
              cpu: 1000m
              memory: 2048Mi
          volumeMounts:
            - mountPath: /var/lib/grafana
              name: grafana-pv
      imagePullSecrets:
        - name: your-secret
      volumes:
        - name: grafana-pv
          persistentVolumeClaim:
            claimName: grafana-pvc
---
apiVersion: v1
kind: Service
metadata:
  name: grafana
  namespace: logging
spec:
  ports:
    - port: 3000
      protocol: TCP
      targetPort: http-grafana
      nodePort: 30339
  selector:
    app: grafana
  type: NodePort
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: grafana-ui
  namespace: logging
  labels:
    k8s-app: grafana
spec:
  rules:
    - host: your web address
      http:
        paths:
          - path: /
            backend:
              serviceName: grafana
              servicePort: 3000

Promtail

Promtail的主要作用是进行日志采集，每个K8s宿主机上所存储的docker容器及日志存储是独立的，和Host绑定，为了可以采集到所有节点Node的数据，官方推荐Promatail使用DaemonSet安装，创建loki-promtail.yml文件，文件内容如下：

apiVersion: v1
kind: ServiceAccount
metadata:
  name: loki-promtail
  labels:
    app: promtail
  namespace: logging
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    app: promtail
  name: promtail-clusterrole
  namespace: logging
rules:
- apiGroups: [""]
  resources:
  - nodes
  - nodes/proxy
  - services
  - endpoints
  - pods
  verbs: ["get", "watch", "list"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: promtail-clusterrolebinding
  labels:
    app: promtail
  namespace: logging
subjects:
  - kind: ServiceAccount
    name: loki-promtail
    namespace: logging
roleRef:
  kind: ClusterRole
  name: promtail-clusterrole
  apiGroup: rbac.authorization.k8s.io
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: loki-promtail
  namespace: logging
  labels:
    app: promtail
data:
  promtail.yaml: |2-
        client:
          backoff_config:
            max_period: 5m
            max_retries: 10
            min_period: 500ms
          batchsize: 1048576
          batchwait: 1s
          external_labels: {}
          timeout: 10s
        positions:
          filename: /run/promtail/positions.yaml
        server:
          http_listen_port: 3101
        target_config:
          sync_period: 10s
        scrape_configs:
        - job_name: kubernetes-pods-name
          pipeline_stages:
            - docker: {}
          kubernetes_sd_configs:
          - role: pod
          relabel_configs:
          - source_labels:
            - __meta_kubernetes_pod_label_name
            target_label: __service__
          - source_labels:
            - __meta_kubernetes_pod_node_name
            target_label: __host__
          - action: drop
            regex: ''
            source_labels:
            - __service__
          - action: labelmap
            regex: __meta_kubernetes_pod_label_(.+)
          - action: replace
            replacement: $1
            separator: /
            source_labels:
            - __meta_kubernetes_namespace
            - __service__
            target_label: job
          - action: replace
            source_labels:
            - __meta_kubernetes_namespace
            target_label: namespace
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_name
            target_label: pod
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_container_name
            target_label: container
          - replacement: /var/log/pods/$1/**/*.log
            separator: _
            source_labels:
            - namespace
            - pod
            - __meta_kubernetes_pod_uid
            target_label: __path__
        - job_name: kubernetes-pods-app
          pipeline_stages:
            - docker: {}
          kubernetes_sd_configs:
          - role: pod
          relabel_configs:
          - action: drop
            regex: .+
            source_labels:
            - __meta_kubernetes_pod_label_name
          - source_labels:
            - __meta_kubernetes_pod_label_app
            target_label: __service__
          - source_labels:
            - __meta_kubernetes_pod_node_name
            target_label: __host__
          - action: drop
            regex: ''
            source_labels:
            - __service__
          - action: labelmap
            regex: __meta_kubernetes_pod_label_(.+)
          - action: replace
            replacement: $1
            separator: /
            source_labels:
            - __meta_kubernetes_namespace
            - __service__
            target_label: job
          - action: replace
            source_labels:
            - __meta_kubernetes_namespace
            target_label: namespace
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_name
            target_label: pod
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_container_name
            target_label: container
          - replacement: /var/log/pods/$1/**/*.log
            separator: _
            source_labels:
            - namespace
            - pod
            - __meta_kubernetes_pod_uid
            target_label: __path__
        - job_name: kubernetes-pods-direct-controllers
          pipeline_stages:
            - docker: {}
          kubernetes_sd_configs:
          - role: pod
          relabel_configs:
          - action: drop
            regex: .+
            separator: ''
            source_labels:
            - __meta_kubernetes_pod_label_name
            - __meta_kubernetes_pod_label_app
          - action: drop
            regex: '[0-9a-z-.]+-[0-9a-f]{8,10}'
            source_labels:
            - __meta_kubernetes_pod_controller_name
          - source_labels:
            - __meta_kubernetes_pod_controller_name
            target_label: __service__
          - source_labels:
            - __meta_kubernetes_pod_node_name
            target_label: __host__
          - action: drop
            regex: ''
            source_labels:
            - __service__
          - action: labelmap
            regex: __meta_kubernetes_pod_label_(.+)
          - action: replace
            replacement: $1
            separator: /
            source_labels:
            - __meta_kubernetes_namespace
            - __service__
            target_label: job
          - action: replace
            source_labels:
            - __meta_kubernetes_namespace
            target_label: namespace
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_name
            target_label: pod
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_container_name
            target_label: container
          - replacement: /var/log/pods/$1/**/*.log
            separator: _
            source_labels:
            - namespace
            - pod
            - __meta_kubernetes_pod_uid
            target_label: __path__
        - job_name: kubernetes-pods-indirect-controller
          pipeline_stages:
            - docker: {}
          kubernetes_sd_configs:
          - role: pod
          relabel_configs:
          - action: drop
            regex: .+
            separator: ''
            source_labels:
            - __meta_kubernetes_pod_label_name
            - __meta_kubernetes_pod_label_app
          - action: keep
            regex: '[0-9a-z-.]+-[0-9a-f]{8,10}'
            source_labels:
            - __meta_kubernetes_pod_controller_name
          - action: replace
            regex: '([0-9a-z-.]+)-[0-9a-f]{8,10}'
            source_labels:
            - __meta_kubernetes_pod_controller_name
            target_label: __service__
          - source_labels:
            - __meta_kubernetes_pod_node_name
            target_label: __host__
          - action: drop
            regex: ''
            source_labels:
            - __service__
          - action: labelmap
            regex: __meta_kubernetes_pod_label_(.+)
          - action: replace
            replacement: $1
            separator: /
            source_labels:
            - __meta_kubernetes_namespace
            - __service__
            target_label: job
          - action: replace
            source_labels:
            - __meta_kubernetes_namespace
            target_label: namespace
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_name
            target_label: pod
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_container_name
            target_label: container
          - replacement: /var/log/pods/$1/**/*.log
            separator: _
            source_labels:
            - namespace
            - pod
            - __meta_kubernetes_pod_uid
            target_label: __path__
        - job_name: kubernetes-pods-static
          pipeline_stages:
            - docker: {}
          kubernetes_sd_configs:
          - role: pod
          relabel_configs:
          - action: drop
            regex: ''
            source_labels:
            - __meta_kubernetes_pod_annotation_kubernetes_io_config_mirror
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_label_component
            target_label: __service__
          - source_labels:
            - __meta_kubernetes_pod_node_name
            target_label: __host__
          - action: drop
            regex: ''
            source_labels:
            - __service__
          - action: labelmap
            regex: __meta_kubernetes_pod_label_(.+)
          - action: replace
            replacement: $1
            separator: /
            source_labels:
            - __meta_kubernetes_namespace
            - __service__
            target_label: job
          - action: replace
            source_labels:
            - __meta_kubernetes_namespace
            target_label: namespace
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_name
            target_label: pod
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_container_name
            target_label: container
          - replacement: /var/log/pods/$1/**/*.log
            separator: _
            source_labels:
            - namespace
            - pod
            - __meta_kubernetes_pod_uid
            target_label: __path__
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: loki-promtail
  namespace: logging
  labels:
    app: promtail
spec:
  selector:
    matchLabels:
      app: promtail
  updateStrategy:
    rollingUpdate:
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: promtail
    spec:
      serviceAccountName: loki-promtail
      containers:
        - name: promtail
          image: grafana/promtail:2.3.0
          imagePullPolicy: IfNotPresent
          args: 
          - -config.file=/etc/promtail/promtail.yaml
          - -client.url=http://loki:3100/loki/api/v1/push
          env: 
          - name: HOSTNAME
            valueFrom: 
              fieldRef: 
                apiVersion: v1
                fieldPath: spec.nodeName
          volumeMounts:
          - mountPath: /etc/promtail
            name: config
          - mountPath: /run/promtail
            name: run
          - mountPath: /var/lib/docker/containers
            name: docker
            readOnly: true
          - mountPath: /var/log/pods
            name: pods
            readOnly: true
          ports:
          - containerPort: 3101
            name: http-metrics
            protocol: TCP
          securityContext:
            readOnlyRootFilesystem: true
            runAsGroup: 0
            runAsUser: 0
          readinessProbe:
            failureThreshold: 5
            httpGet:
              path: /ready
              port: http-metrics
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 1
      imagePullSecrets:
        - name: your-secret
      tolerations:
      - effect: NoSchedule
        key: node-role.kubernetes.io/master
        operator: Exists
      volumes:
        - name: config
          configMap:
            defaultMode: 420
            name: loki-promtail
        - name: run
          hostPath:
            path: /run/promtail
            type: ""
        - name: docker
          hostPath:
            path: /var/lib/docker/containers
        - name: pods
          hostPath:
            path: /var/log/pods

在安装过程中最容易遇到问题的应该就是Promtail配置的过程了，首先需要明白其工作原理，Promtail的优势在于如果直接采集Docker容器的日志，可以使用官方提供的模板自动采集，对于应用没有侵入，不需要进行特殊配置。

使用Promtail核心操作在于两步

  1. 挂载k8s节点宿主机到容器内目录，这一步需要注意Docker的工作目录，默认为/var/lib/docker/，如果修改了，在挂载目录时需要同步修改。k8s 1.14之前版本为/var/log/pods/<pod_uid>/<container_name>/<num>.log，1.14 or later: /var/log/pods/<namespace>_<pod_name>_<pod_uid>/<container_name>/<num>.log。其中num为容器重启的次数，使用ls -l命令查看会发现/var/log/pods/中的日志文件为软链接/var/lib/docker/中的文件，因此在挂载时后需要注意。
  2. 日志文件路径匹配，在进行relabel_configs配置时需要结合容器中的实际地址进行标签设置。
          - action: replace
            source_labels:
            - __meta_kubernetes_pod_container_name
            target_label: container
          - replacement: /var/log/pods/$1/**/*.log
            separator: _
            source_labels:
            - namespace
            - pod
            - __meta_kubernetes_pod_uid
            target_label: __path__

当遇到__path__时会将replacement替换为具体的文件路径，$1表示取source_labels中的第一个参数，在此对应namespace，这里的namespace已经进行了替换，会被拼接为实际的值。

注意事项

Loki的安装使用k8s会很简单，如果使用helm就更简单了，基于笔者使用的环境为内网，所以通过下载离线镜像的方式，在内网私服进行安装，过程很简单，细节是魔鬼。在安装过程中也踩了很多坑，知其然更知其所以然才能避开安装过程中的问题，如果参考了很多博客，安装过程没问题，却依然不能正常使用，那肯定是环境或者配置问题导致的，在此记录，希望遇到相同问题的人可以得到一些帮助。

关于Loki和Promtail安装中涉及到的ConfigMap中的配置项就不再赘述，详细的配置内容可以参考：

其他参考资料：

标签：__,name,Kubernetes,labels,Loki,kubernetes,pod,loki,轻量级
From： https://www.cnblogs.com/starsray/p/17549842.html

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